Reaction Pathways during Coprocessing. Reaction of Illinois No. 6 and Wyodak Coals with Lloydminster and Hondo Residua under Mild Conditions
Küçük Resim Yok
Tarih
1991
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Illinois No. 6 and Wyodak coals were coprocessed with Lloydminster and Hondo residua. The reactions were carried out in argon or in dideuterium with and without a catalyst at 400 °C for 1 h. The coal conversions under these mild conditions ranged from 40 to 56 %. Wyodak coal and Lloydminster residuum provided the highest coal conversion in uncatalyzed reactions. Spectroscopic evidence indicated that coal fragments appeared in the oil fraction at short reaction times but that they were much more abundant in the asphaltene fraction. An analysis of the results implies that coprocessing is essentially a stepwise process in which coals are degraded to asphaltenes and then to oils via hydrogen atom transfer and carbon-carbon bond fragmentation processes as well as deoxygenation reactions. Adduction reactions of the aliphatic residua and the aromatic coal occur simultaneously. The reactivity of the coal, in particular its capacity to initiate free-radical chain reactions and to donate hydrogen atoms, appears to play a key role in this chemistry. © 1991, American Chemical Society. All rights reserved.
Açıklama
Anahtar Kelimeler
Chemcial Reaction--Assoication, Coal--Phase Equilibria, Extraction--Reaction Kinetics, Solvents--Effects, Associative Equilibria, Coal Rank, High Volatile Bituminous Coal, Pyridine Extractability, Solvent Induced Associaton, Lignite
Kaynak
Energy and Fuels
WoS Q Değeri
Scopus Q Değeri
Q1
Cilt
5
Sayı
3
